|Trade names||Adipex-p, Duromine, Metermine, Suprenza|
|Bioavailability||High (almost complete)|
|Protein binding||Approximately 96.3%|
|Elimination half-life||25 hours, urinary pH-dependent|
|Excretion||Urinary (62–85% unchanged)|
|Chemical and physical data|
|Molar mass||149.233 g/mol|
|3D model (JSmol)|
Phentermine (contracted from phenyl-tertiary-butylamine), also known as α,α-dimethylphenethylamine, is a psychostimulant drug of the substituted amphetamine chemical class, with pharmacology similar to amphetamine. It is used medically as an appetite suppressant for short term use, as an adjunct to exercise and reducing calorie intake.
Phentermine may produce cardiovascular, gastrointestinal, and CNS side effects; rare cases of pulmonary hypertension and cardiac valvular disease have been reported. It should not be used by people who have a history of drug abuse, have cardiovascular disease, hyperthyroidism, glaucoma, or are pregnant, planning to become pregnant, or breast-feeding. It should not be taken by anyone taking a monoamine oxidase inhibitor. Drinking alcohol while using phentermine may cause adverse effects.
It was first introduced in 1959, and became part of the drug combination fen-phen that was withdrawn from the market in 1997 due to the fenfluramine component damaging people's heart valves. In 2012 a different combination drug, phentermine/topiramate was approved in the US.
Different formulations of phentermine as a single agent are available under various brand names, in many countries.
Phentermine is approved for up to 12 weeks of use and most weight loss occurs in the first weeks. However, significant loss continues through the sixth month and has been shown to continue at a slower rate through the ninth month.
- have a history of drug abuse.
- are allergic to sympathomimetic amine drugs.
- are taking a monoamine oxidase inhibitor (MAOI) or have taken one within the last 14 days.
- have cardiovascular disease, hyperthyroidism, or glaucoma.
- are pregnant, planning to become pregnant, or breast-feeding.
Rare cases of pulmonary hypertension and cardiac valvular disease have been reported. Tolerance usually occurs; however, risks of dependence and addiction are considered negligible. People taking phentermine may be impaired when driving or operating machinery. Consumption of alcohol with phentermine may produce adverse effects.
- Cardiovascular effects like palpitations, tachycardia, high blood pressure, precordial pain; rare cases of stroke, angina, myocardial infarction, cardiac failure and cardiac arrest have been reported.
- Central nervous system effects like overstimulation, restlessness, nervousness, insomnia, tremor, dizziness and headache; there are rare reports of euphoria followed by fatigue and depression, and very rarely, psychotic episodes and hallucinations.
- Gastrointestinal effects include nausea, vomiting, dry mouth, cramps, unpleasant taste, diarrhea, and constipation.
- Other adverse effects include trouble urinating, rash, impotence, changes in libido, and facial swelling.
Mechanism of action
Phentermine has some similarity in its pharmacodynamics with its parent compound, amphetamine, as they both are TAAR1 agonists, where the activation of TAAR1 in monoamine neurons facilitates the efflux or, release into the synapse, of these neurochemicals; at clinically relevant doses, phentermine primarily acts as a releasing agent of norepinephrine in neurons, although, to a lesser extent, it releases dopamine and serotonin into synapses as well. Phentermine may also trigger the release of monoamines from VMAT2, which is a common pharmacodynamic effect among substituted amphetamines. The primary mechanism of phentermine's action in treating obesity is the reduction of hunger perception, which is a cognitive process mediated primarily through several nuclei within the hypothalamus (in particular, the lateral hypothalamic nucleus, arcuate nucleus, and ventromedial nucleus). Outside the brain, phentermine releases norepinephrine and epinephrine – also known as noradrenaline and adrenaline respectively – causing fat cells to break down stored fat as well.
Phentermine was marketed with fenfluramine or dexfenfluramine as a combination appetite suppressant and fat burning agent under the popular name fen-phen. In 1997, after 24 cases of heart valve disease in fen-phen users, fenfluramine and dexfenfluramine were voluntarily taken off the market at the request of the FDA. Studies later showed nearly 30% of people taking fenfluramine or dexfenfluramine for up to 24 months had abnormal valve findings.
Phentermine is still available by itself in most countries, including the US. However, because it is similar to amphetamine, it is classified as a controlled substance in many countries. Internationally, phentermine is a schedule IV drug under the Convention on Psychotropic Substances. In the United States, it is classified as a Schedule IV controlled substance under the Controlled Substances Act. In contrast, amphetamine preparations are classified as Schedule II controlled substances.
A company called Vivus developed a combination drug, phentermine/topiramate that it originally called Qnexa and then called Qsymia, which was invented and used off-label by Thomas Najarian, who opened a weight-clinic in Los Osos, California in 2001; Najarian had previously worked at Interneuron Pharmaceuticals, which had developed one of the fen-phen drugs previously withdrawn from the market. The FDA rejected the combination drug in 2010 due to concerns over its safety. In 2012 the FDA approved it after Vivus re-applied with further safety data. At the time, one obesity specialist estimated that around 70% of his colleagues were already prescribing the combination off-label.
- Benzaldehyde and 2-nitropropane are cross-reacted in a variant of the Henry reaction
- The nitro group is reduced with hydrogen gas over Raney nickel catalyst
- The hydroxyl group is chlorinated with thionyl chloride to yield 2-amino-1-chloro-2-methyl-1-phenylpropane
- This is reduced with hydrogen gas over a palladium on magnesium glycinate catalyst to yield the product, phentermine
Society and culture
Phentermine is marketed under many brand names and formulations worldwide, including Acxion, Adipex, Duromine, Elvenir, Fastin, Lomaira (phentermine hydrochloride) 8 mg tablets, Panbesy, Qsymia (phentermine and topiramate), Razin, Redusa, Sentis, Suprenza, and Terfamex.
- "METERMINE (Phentermine)" (PDF). TGA eBusiness Services. iNova Pharmaceuticals (Australia) Pty Limited. 22 July 2013. Retrieved 16 November 2013.
- "International brands for phentermine". Drugs.com. Retrieved 13 October 2016.
- "Phentermine label at FDA" (Last updated: January 2012). FDA. Retrieved 13 October 2016.
- Glazer G (August 2001). "Long-term Pharmacotherapy of Obesity 2000". Archives of Internal Medicine. 161 (15): 1814–1824. doi:10.1001/archinte.161.15.1814. ISSN 0003-9926.
- Haslam D (February 2016). "Weight management in obesity – past and present". International Journal of Clinical Practice. 70 (3): 206–217. doi:10.1111/ijcp.12771. ISSN 1368-5031. PMC 4832440. PMID 26811245.
- Barak LS, Salahpour A, Zhang X, Masri B, Sotnikova TD, Ramsey AJ, Violin JD, Lefkowitz RJ, Caron MG, Gainetdinov RR (September 2008). "Pharmacological characterization of membrane-expressed human trace amine-associated receptor 1 (TAAR1) by a bioluminescence resonance energy transfer cAMP biosensor". Mol. Pharmacol. 74 (3): 585–94. doi:10.1124/mol.108.048884. PMC 3766527. PMID 18524885.
we confirmed agonistic activity at human TAAR1 of several other compounds, including the trace amines octopamine and tryptamine, the amphetamine derivatives l-amphetamine, d-methamphetamine, (+)-MDMA, and phentermine, and the catecholamine metabolites 3-MT and 4-MT (Bunzow et al., 2001; Lindemann and Hoener, 2005; Reese et al., 2007; Wainscott et al., 2007; Wolinsky et al., 2007; Xie and Miller, 2007; Xie et al., 2007).
- Rothman RB, Baumann MH, Dersch CM, et al. (January 2001). "Amphetamine-type central nervous system stimulants release norepinephrine more potently than they dopamine and serotonin". Synapse. 39 (1): 32–41. doi:10.1002/1098-2396(20010101)39:1<32::AID-SYN5>3.0.CO;2-3. PMID 11071707.
- Ryan, Donna A.; Bray, George A. (2014). "Sibutramine, Phentermine, and Diethylproprion: Sympathomimetic Drugs in the Management of Obesity". In Bray, George A.; Bouchard, Claude. Handbook of Obesity - Volume 2 Clinical Applications, Fourth Edition (4th ed.). Hoboken: Taylor and Francis. p. 234. ISBN 9781841849829.
- "FDA Announces Withdrawal Fenfluramine and Dexfenfluramine (Fen-Phen)". Fda.gov. Retrieved 12 July 2013.
- Weigle, DS (June 2003). "Pharmacological therapy of obesity: past, present, and future". The Journal of Clinical Endocrinology and Metabolism. 88 (6): 2462–9. doi:10.1210/jc.2003-030151. PMID 12788841.
- Convention on Psychotropic Substances (PDF file) Archived 14 March 2014 at the Wayback Machine.
- Rueda-Clausen, CF; Padwal, RS; Sharma, AM (August 2013). "New pharmacological approaches for obesity management". Nature Reviews. Endocrinology. 9 (8): 467–78. doi:10.1038/nrendo.2013.113. PMID 23752772.
- Pollack, Andrew (16 February 2012). "Diet Treatment, Already in Use, to Get F.D.A. Review". The New York Times.
- "FDA approves weight-management drug Qsymia". FDA. 17 July 2012.
- U.S. Patent 2,408,345
- U.S. Patent 2,590,079